固化程度相关的车身减震胶力学特性测试与表征

Test and characterization on mechanical properties of curing degree correlated damping adhesive

为解决汽车车身减震胶粘接结构在烘烤固化后出现的局部凹陷的变形问题,通过简单样件试验及实车检测,结合材料行为测试分析结果,探究粘接结构烘烤变形的产生机理。通过胶黏剂材料性能的测试分析及一系列力学热学试验,获得了车身常用减震胶粘剂的固化特性、膨胀特性及粘弹特性,并对膨胀特性和粘弹性的固化程度相关性进行了表征研究。结果表明:与温度相关的胶模量和膨胀特性是局部凹陷产生的主要因素。该研究结果对汽车制造中的材料选择及结构设计具有指导意义。

Local depression deformation after curing is observed in damping adhesive structures in vehicle body manufacturing. To solve this problem, sample tests and real car measurement were conducted and material properties of damping adhesive were tested, to reveal the formation mechanisms of curing deformation. Curing characteristics, expansion behaviors and viscoelasticity properties of commonly used damping adhesive were obtained from the experiments on the material properties of damping adhesive and a series of mechanical and thermal tests. The correlations between expansion behavior/viscoelasticity property and curing degree were investigated. The results show that modulus and expansion property of adhesive are two important factors to curing deformation. The conclusion guides material selection and structural design in vehicle body manufacturing.